Fuel tank fueling device having cam mechanism

Abstract

A fuel tank fueling device for feeding fuel through the fuel passage of an inlet pipe into a tank main body is provided. The fueling device is easier to manipulate when the fuel cap is opened and closed, and also has better fuel tank sealing properties against the outside air. The fueling device includes a handle provided on a casing main body, operated to open and close the fuel passage; a sealing component interposed between the casing main body and the seat surface of the fuel inlet pipe; a spring disposed so as to urge the sealing component against the seat surface; and a cam mechanism whereby the operating force of the handle in the closing direction is converted via the spring into the sealing force of the sealing component pressing against the seat surface.

What is claimed is:  
     
       1. A fuel tank fueling device for fueling a tank main body through a fuel passage of an inlet pipe that has neck engagement threading formed on an inner wall thereof, the fuel tank fueling device comprising: 
       a casing main body detachably mounted on the inlet pipe;  
       a handle disposed on the casing main body for opening and closing the fuel passage;  
       a gasket disposed at an upper part of the casing main body for sealing against a seat surface of the inlet pipe;  
       a spring disposed on the casing main body, the spring constructed and arranged to press the gasket against the seat surface;  
       an upper cam ring mounted rotatably on a periphery of the casing main body disposed under the gasket, rotation of the upper cam ring being blocked by the neck engagement threading; and  
       a lower cam ring movably mounted in an axial direction on a periphery of the casing main body,  
       wherein the lower cam ring is guided along the upper cam ring at the beginning of the rotating operation of the handle, and is positioned by the neck engagement threading after moving in an axial direction when rotated subsequent to the initial rotation, and is guided in such a way as to press the spring while thus positioned so that the gasket seals the seat surface.